tencent cloud

This document shows you how to connect website applications to Anti-DDoS Advanced instances and verify forwarding configurations.

Note：

It currently supports connecting website applications in Beijing, Shanghai, and Guangzhou, while regions outside the Chinese mainland are not supported.

Prerequisites

• Purchase an Anti-DDoS Advanced instance before adding a forwarding rule.
• Purchase a domain name resolution service before modifying the DNS information of your business domain name.

Process

Directions

Configuring-a-forwarding-rule">

Configuring a forwarding rule

1. Log in to the Anti-DDoS console and click Anti-DDoS Advanced -> Access Configuration on the left sidebar.
2. Open the Website Scenario tab, find and select the target Anti-DDoS Advanced instance, and add a forwarding rule.
   • Create a single forwarding rule:
     1. Click Create.
3. On the Add forwarding rule page, configure the following parameters as needed and click OK.

    Parameter description:

   • Domain: enter the domain name to be protected.
   • Protocol: HTTP and HTTPS are supported, you can tick one as needed.

     Scenario	Operation
     Websites with HTTP only	Tick **HTTP**.
     Websites with HTTPS only	Tick **HTTPS**. Certificate source: the Tencent Cloud hosted certificate is selected by default. Certificate: select the corresponding SSL certificate.

   • Forwarding method: Forwarding via IP and Forwarding via domain name are supported.
   • Enter the real server IP or real server domain name based on the forwarding method.

        - If you tick **Forwarding via IP**, enter the real server IP (or IP + port). If a domain name corresponds to multiple real server IPs (or multiple pairs of IP + port), you can enter all of them and separate them with carriage return. Up to 16 entries are supported.
        - If you tick **Forwarding via domain name**, enter the forwarding domain name (CNAME) or domain name (CNAME) + port. If a domain name corresponds to multiple real server domain names (CNAME) or multiple pairs of domain name (CNAME) + port, you can enter all of them and separate them with carriage return. Up to 16 entries are supported.

     • Create multiple forwarding rules in batches:
       1. Click Batch import -> Import forwarding rules.
       2. Paste rules in the rule input box.

          Note：

          • From left to right, paste the domain name, protocol, real server IP (real server domain name is currently not supported), and real server port; separate the real server IP and real server port with : and others with spaces; only one forwarding rule can be entered per line.
          • The number of forwarding rule entries added in batches cannot exceed the current quota.

Allowing-the-forwarding-IP-range">

Allowing the forwarding IP range

To prevent the service unavailability that occurs when the real server blocks Anti-DDoS Advanced's forwarding IP, we recommend configuring allowlist policies for the real server infrastructure, including firewall, Web Application Firewall, intrusion prevention system (IPS), and traffic management, and disabling the protection feature of the host firewall and other security software (such as Safedog) or setting allowlist policies, so that the forwarding IP will not be affected by the security policies of the real server.
To view the detailed Anti-DDoS Advanced forwarding IP range, you can log in to the Anti-DDoS console, click Anti-DDoS Advanced -> Resource List on the left sidebar, find the row of the target Anti-DDoS Advanced instance, and click its ID/Name.

Verifying-the-configuration-locally">

Verifying the configuration locally

After the forwarding configuration is completed, the Anti-DDoS Advanced IP will forward the packets from the relevant port to the corresponding real server port by following the forwarding rules.
To ensure the stability of your business, a local test is recommended. The verification methods are as follows:

1. Modify your local hosts file to direct local requests to the protected website to the Anti-DDoS Advanced IP.
   Take Windows operating system as an example:
   1. Open the hosts file in C:\Windows\System32\drivers\etc, and add the following content at the end of the text:
      <Anti-DDoS Advanced IP address> <Domain name of the protected website>
      For example, if the Anti-DDoS Advanced IP is 10.1.1.1 and the domain name is [www.qq.com](www.qq.com), add:
      10.1.1.1 www.qq.com
   2. Save the hosts file.
2. Run the ping command on the local computer to test the protected domain name.
   If the resolved IP address is the Anti-DDoS Advanced IP address bound in the hosts file, the forwarding is successful.

   Note：

   If the resolved IP address is still the real server IP address, try running the ipconfig/flushdns command in the Windows Command Prompt to clear the local DNS cache.

3. After successful configuration of hosts, check whether the domain name can be accessed.
   If yes, the configuration has taken effect.

Note：

If the verification still fails with the correct method, please log in to the Anti-DDoS console and check whether the configuration is correct. If the problem persists after you fix any incorrect configuration items, please contact Tencent Cloud technical support.

Modifying-the-DNS-resolution-of-the-business-domain-name">

Modifying the DNS resolution of the business domain name

Before using Anti-DDoS Advanced, you need to configure the A record of your business domain name's DNS with an Anti-DDoS Advanced IP, so that all user access requests to your site will pass through Anti-DDoS Advanced first before arriving at the real server (that is, all traffic will be first directed to Anti-DDoS Advanced before getting to the real server).

Note：

The principle of domain name resolution configuration is consistent, but the configuration methods in different service providers may be different. Here the Tencent Cloud DNSPod is used.

1. Log in to the DNSPod console, click Domain Name Resolution List on the left sidebar, and click Resolve on the right of a domain name.
2. Open the Record Management tab, click Add Records to modify the IP address pointed to by the A record to the Anti-DDoS Advanced IP address, and click Save.